1order of copper layers: 2 Copper 1: Front 3 Copper 2: Inner3 4 Copper 3: Inner2 5 Copper 4: Back 6 7PCB description: 4 layer PCB 0.062 in 8 Copper 1 0.5 oz foil plated to approximately 0.0017 in 9 Dielectric 1-2 0.0119 in 10 Copper 2 1 oz foil (0.0014 in) 11 Dielectric 2-3 0.0280 in 12 Copper 3 1 oz foil (0.0014 in) 13 Dielectric 3-4 0.0119 in 14 Copper 4 0.5 oz foil plated to approximately 0.0017 in 15FR4 or similar substrate with Er=4.5 (+/- 0.1) 16double side solder mask black 17single side silkscreen white 186 mil min trace width and 196 mil min isolation 20