I have a sudden appreciation for this thread, as I just received a lab report on 
my mystery gold plated boards from a month or so back.

These were the ENiG boards with a flat but scratched looking surface.  
Randomly located XRF measuremenents show Au thicknesses anywhere from 
2.2ui to 8.2ui.  Rough estimating, the gold thickness=solder paste thickness, I 
wonder what percentage of gold I'll find in those joints?

But at least they finally explained why they sent such a terrible microsection 
with their sample boards.  They accidently sent the one they meant to 
reject.  As though it's a cure for my insomnia or something........

Peter

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