Cal. INS § 11780.5

(a) The fund may also insure a California employer against his or her liability for workers’ compensation benefits, under the law of any other state, for California employees temporarily working outside of California on a specific assignment if the fund insures the employer’s other employees who work within California.

(b) (1) The fund is only authorized under this subdivision to insure an employer whose principal place of business is in California, provided the majority of the employer’s operations and employees are located within California, against his or her liability for workers’ compensation benefits, under the law of any other state, if the fund insures the employer’s employees who work within California.

(2) The fund is only authorized pursuant to this subdivision to contract as a reinsurer with a ceding insurer that has responded to a request for proposal from the fund and is admitted to transact workers’ compensation insurance in California and in the out-of-state jurisdiction where the non-California employees are located. The fund may only contract for purposes of this subdivision if the ceding insurer meets all of the following criteria:

(A) The insurer has an A minus (A-) rating or better from A.M. Best Company.

(B) The insurer has substantial prior experience in transacting workers’ compensation business on another insurer’s behalf.

(C) The insurer has a minimum surplus of one hundred million dollars ($100,000,000).

(c) The fund shall not initiate paid advertising or solicit sponsorship of advertising campaigns to market or promote to prospective insureds the ability to insure qualified employers under the law of any other state.