Cal. Unemp. Ins. Code § 1176

If, by reason of an employee receiving wages from more than one employer during any calendar year, the wages received by him or her during such year exceed the remuneration upon which contributions are payable under Section 985, and the sum of the amount of tax imposed by Section 984 plus the amount of contributions under Section 3260 deducted from such wages exceeds the amount required under this division, the employee is entitled to a refund or credit of the amount of the excess.