If you are looking for the plating thickness for A-4JA from Amphenol RF, the below information can be a reference.
Per the manufacturer:
“We have the below plating thickness (in inches) for the gold plating.
GOLD PLATE (.000050/.000070) THICK PER MIL-G-45204.”
Applicable part numbers
ARF3390TR-ND
ARF3390CT-ND
ARF3390DKR-ND