CALIFORNIA EVIDENCE: CIVIL AND CRIMINAL
...Opinion & Scientific Evidence
......Expert Testimony: In General
.........Things Expert May Rely On
............Opinion of Others
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Where expert opinion based in part on opinion or statement of another, person relied upon is subject to cross-examination, unless s/he is a party or testified on subject in action.

Expert may rely upon opinions of other experts, but may not testify on direct exam as to content of those other opinions. Expert may be cross-examined on content.

Witness may state on direct examination that opinion was based upon opinion of another, but content of second opinion is inadmissible hearsay.

Where opinion based upon report of opinion of another, it may be read into record, but writing not admitted.