... 1.6mm,immersion gold 2 layer,1.6mm,immersion Tin 4layer,1.6mm,immersion gold,plated slot, 4layer,1 ... .6mm,immersion gold,half holegold finger 4layer,2. ... 0mm,immersion sliver 6layer,2.0mm,immersion gold,BGA,half hole 12layer, 2.4mm, BGA, ... different impedance 8layer, 0.8mm, immersion gold,impedance control HDI 14layer, 1.6mm, matt green, ...