... ) HDI PCB assembly 2 layer,1.6mm,immersion gold 2 layer,1.6mm,immersion Tin 4layer,1.6mm,immersion gold,plated slot, 4layer,1.6mm,immersion gold,half ... contro14layer, 1.6mm, matt green, BGA,impedance control With regard to our PCB prdocts,pleas find the following specification,table1 and 2 ...