Cal. Civ. Proc. Code § 877.5

(a) Where an agreement or covenant is made which provides for a sliding scale recovery agreement between one or more, but not all, alleged defendant tortfeasors and the plaintiff or plaintiffs:
1. (1) The parties entering into any such agreement or covenant shall promptly inform the court in which the action is pending of the existence of the agreement or covenant and its terms and provisions.
2. (2) If the action is tried before a jury, and a defendant party to the agreement is called as a witness at trial, the court shall, upon motion of a party, disclose to the jury the existence and content of the agreement or covenant, unless the court finds that this disclosure will create substantial danger of undue prejudice, of confusing the issues, or of misleading the jury.
  The jury disclosure herein required shall be no more than necessary to inform the jury of the possibility that the agreement may bias the testimony of the witness.
(b) As used in this section, a “sliding scale recovery agreement” means an agreement or covenant between a plaintiff or plaintiffs and one or more, but not all, alleged tortfeasor defendants, which limits the liability of the agreeing tortfeasor defendants to an amount which is dependent upon the amount of recovery which the plaintiff is able to recover from the nonagreeing defendant or defendants. This includes, but is not limited to, agreements within the scope of Section 877, and agreements in the form of a loan from the agreeing tortfeasor defendant or defendants to the plaintiff or plaintiffs which is repayable in whole or in part from the recovery against the nonagreeing tortfeasor defendant or defendants.
(c) No sliding scale recovery agreement is effective unless, at least 72 hours prior to entering into the agreement, a notice of intent to enter into an agreement has been served on all nonsignatory alleged defendant tortfeasors. However, upon a showing of good cause, the court or a judge thereof may allow a shorter time. The failure to comply with the notice requirements of this subdivision shall not constitute good cause to delay commencement of trial.