> 
> I think 2-layer and 4-layer board are easier to
> differentiate but I have
> no experience with 6-layer board. Maybe the guy has
> seen so many
> board so that he can look through the PCB...
> Sometimes experience
> can really be amazing...
> 
> Regards,
> Xiaofan
> -- 
  Or maybe he has x-ray vision :) Just kidding.  But
seriously how does one differentiate 2 layer and 4
layers? I can't see the traces between them.

John

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