Cal. Pub. Util. Code § 240309

(a) The bonds authorized by the voters concurrently with the approval of the retail transactions and use tax may be issued at any time by the commission and shall be payable from the proceeds of the tax. The bonds shall be referred to as “limited tax bonds.”
The bonds may be secured by a pledge of revenues from the proceeds of the tax.
(b) The pledge of the tax to the limited tax bonds authorized under this chapter shall have priority over the use of any of the tax for “pay-as-you-go” financing, except to the extent that that priority is expressly restricted in the resolution authorizing the issuance of the bonds.