ALAMEDA -- Officials with the Alameda Unified School District say they are offering teachers an overall raise of 2 percent in their current contract talks, plus other financial rewards for those who participate in a pilot program aimed at boosting student achievement.

The offer, which the district announced Thursday, follows teachers overwhelmingly rejecting a tentative contract in April, saying it did not go far enough to offset previous pay cuts or to support lower class sizes.

According to the district, its current offer would provide beginning teachers who participate in the voluntary pilot program with a more than 6 percent total increase in compensation over two years. Other teachers who participate would receive a more than 3 percent increase, the district said.

The proposed program, which aims to close the achievement gap among white and some minority students, is called "Professional Learning Communities" and would feature teachers, administrators and others working together to determine what brings the best results in the classroom.

A representative of the Alameda Education Association, which represents approximately 500 teachers, was not immediately available for comment on the district's offer.

The contract between the teachers and the district expired in June.

The tentative contract rejected by teachers in April offered a one-time bonus equal to 1 percent of their salary and a 1.5 percent raise that would have kicked in this year. That raise, however, would have switched to a one-time payment in the event that the state cut funding to the district.

The district's announcement Thursday comes on the heels of Gov. Jerry Brown saying that his proposed budget would inject an additional $2.7 billion into public education next year. But Alameda officials said his spending plan still offered "novel funding formulas" and that it remained unclear how it would effect the district.

District officials also noted that they are facing a potential one-time loss of up to $13.6 million in the event that opponents of Measure H -- the parcel tax that voters passed in 2008 to benefit local schools -- are successful in their legal challenge to invalidate the tax.

As a result of the lawsuit and uncertainty in state funding, the salary proposal to the teachers includes an opportunity for either side to re-open negotiations over salary next January, according to the district.

Reach Peter Hegarty at 510-748-1654 or follow him on Twitter.com/Peter_Hegarty/.