California Code, Elections Code - ELEC § 6461

(a) The delegation of each candidate shall be composed as follows:

(b) There shall be no more than one alternate per delegate. Alternates shall be appointed by the candidate or his or her designee and shall be appointed by congressional districts, the number per congressional district to be no less than three. Such alternates shall be submitted to the Secretary of State within 30 days after the primary for certification.

(c) Each delegate to the Republican National Convention shall use his or her best efforts at the convention for the party's presidential nominee candidate from California to whom the delegate has pledged support until the person is nominated for the office of President of the United States by the convention, receives less than 10 percent of the votes for nomination by the convention, releases the delegate from his or her obligation, or until two convention nominating ballots have been taken. Thereafter, each delegate shall be free to vote as he or she chooses, and no rule may be adopted by a delegation requiring the delegation to vote as a body or causing the vote of any delegate to go uncounted or unreported.