Copper count and material count are differentA conceptual four-layer board contains separate conductive and insulating layers. Actual layer functions and interconnections come from the released stackup.Copper count and material count are differentConceptual cross-section; thicknesses and proportions are illustrativeOuter copper layer 1Bonded dielectricInner copper layer 2Core dielectricInner copper layer 3Bonded dielectricOuter copper layer 4Four conductor layers; dielectric, mask and legend are not additional copper layers.³Ô¹Ïtv · Engineering explanation · Conceptual, not to scale