Cal. LAB § 1402

(a) An employer who fails to give notice as required by paragraph (1) of subdivision (a) of Section 1401 before ordering a mass layoff, relocation, or termination is liable to each employee entitled to notice who lost his or her employment for:

(1) Back pay at the average regular rate of compensation received by the employee during the last three years of his or her employment, or the employee’s final rate of compensation, whichever is higher.

(2) The value of the cost of any benefits to which the employee would have been entitled had his or her employment not been lost, including the cost of any medical expenses incurred by the employee that would have been covered under an employee benefit plan.

(b) Liability under this section is calculated for the period of the employer’s violation, up to a maximum of 60 days, or one-half the number of days that the employee was employed by the employer, whichever period is smaller.

(c) The amount of an employer’s liability under subdivision (a) is reduced by the following:

(1) Any wages, except vacation moneys accrued prior to the period of the employer’s violation, paid by the employer to the employee during the period of the employer’s violation.

(2) Any voluntary and unconditional payments made by the employer to the employee that were not required to satisfy any legal obligation.

(3) Any payments by the employer to a third party or trustee, such as premiums for health benefits or payments to a defined contribution pension plan, on behalf of and attributable to the employee for the period of the violation.