Did Rex Harrison have a cameo appearance in Star Wars IV?
Request for Question Clarification bydenco-ga
The Internet Movie Database (IMDb), which is considered a definitive
source for movie information, makes no mention of Rex Harrison having
a cameo in any of the "Star Wars" movies.
Neither does the Wikipedia entry for Rex Harrison.
Between those two sources, and others, I have found no evidence of
him appearing in any of the "Star Wars" movies.
If the above will do as the answer to your question, I can post it as
Looking Forward, denco-ga – Google Answers Researcher