(g) Amicus curiae lettersRule 8.520(f) similarly allows such letters after the court has decided to grant review of a case. For example, the court has taken a bunch of letters on Prop. 8, the recent same-sex marriage initiative. As you can see, these can read like formal legal briefs, or informal arguments in letter form.
(1)Any person or entity wanting to support or oppose a petition for review or for an original writ must serve on all parties and send to the Supreme Court an amicus curiae letter rather than a brief.
As the rule says, the letter should be served on all parties. That means that you mail a copy to the California Supreme Court, the Sixth District, the Santa Cruz Superior Court, my ex-wife, and myself. You should also add a signed statement at the end of your letter listing these parties and addresses, certifying that you have mailed a copy to each. You don't have to use a professional process server or get it notarized or anything like that.
If you are interested in writing a letter to the court, send me an email, and I will send a link to my petition. It has the necessary addresses.