... .0mm,immersion sliver 6layer,2.0mm,immersion gold,BGA,half hole 12layer, 2.4mm, BGA, different impedance 8layer, 0.8mm, immersion ... and outer layerImmersion silverBuried/Blind hole0.1mm(4mil)Immersion tinVia hole size(laser drilling)0.076mm(3mils)OSPAspect rations13:1STT(Selected immersion ...