4 layer pcb board spec: 1)Gold coating(0.03-0.05um) 2)2oz for outerlayer 3)EXW:3.75 usd dollars/pc,300$ for testing tool cost 4 layer pcb board spec:1)Gold coating(0.03-0.05um)2)2oz for outerlayer3)EXW:3.75 usd dollars/pc,300$ for testing tool cost Minimum Line Width/Space: 0.1mm- Minimum Finished Drilled Hole Size: 0 .010”- Minimum Finished PCB Thickness: 0.031”- Maximum Finished PCB Thickness: ...