20 copper layers: a counted stack map20 copper layers: a counted stack mapL1 · copperL2 · copperL3 · copperL4 · copperL5 · copperL6 · copperL7 · copperL8 · copperL9 · copperL10 · copperL11 · copperL12 · copperL13 · copperL14 · copperL15 · copperL16 · copperL17 · copperL18 · copperL19 · copperL20 · copperCopper layers are counted; core and PP are dielectric regions between them.Layer roles and dielectric thickness must be specified separately. No fabrication approval is implied.