Cal. Fam. Code § 8700
(d) If a parent and child reside outside this state and the other parent has not relinquished the child for adoption to the department, county adoption agency, or licensed adoption agency, the parent residing out of state may relinquish the child to the department, county adoption agency, or licensed adoption agency by a written statement signed by the relinquishing parent, after the following requirements have been satisfied:
(e)
(1) The relinquishment authorized by this section has no effect until a certified copy is sent to, and filed with, the department. The county adoption agency or licensed adoption agency shall send that copy by certified mail, return receipt requested, or by overnight courier or messenger, with proof of delivery, to the department no earlier than the end of the business day following the signing thereof. The agency shall inform the birth parent that during this time period the birth parent may request that the relinquishment be withdrawn and that, if the birth parent makes the request, the relinquishment shall be withdrawn. The relinquishment shall be final 10 business days after receipt of the filing by the department, unless any of the following applies:
(h) The relinquishing parent has 30 days from the date on which the notice described in subdivision (g) was mailed to rescind the relinquishment.