I have just read through about a thousand messages regarding gold plating in
the Technet archive, but still couldn't find exactly what I need to know:

We have a design with one side all contact switch patterns, and the other
side SMT components. Since we wanted to gold plate the contact patterns, we
were told to just gold plate the whole board.

So the question is:  What gold thickness would be thin enough for the SMT's
and still thick enough for good reliable contacts?  Or is there a better
way?

thanks in advance,
Jack

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