can employers in CA disclose termination to prospective employers?

Your former employer cna disclose that you were terminated, however most employers are very careful of what they discloser for fear of being sued.  Many employers have a policy that they will only confirm the dates that someone worked for them, and  no other information.  If your former employer makes a false statement of fact (not an opinion) about you, and that false statement damages you, it may be liable to you for those damages.