10 layer PCB: copper and dielectric order10 layer PCB: copper and dielectric orderL1 — copperPP bonding gapL2 — copperCured core dielectricL3 — copperPP bonding gapL4 — copperCured core dielectricL5 — copperPP bonding gapL6 — copperCured core dielectricL7 — copperPP bonding gapL8 — copperCured core dielectricL9 — copperPP bonding gapL10 — copperWHAT THE COUNT MEANS10 copper layers4 inner cores5 prepreg bonding gapsConventional foil-build concept.Actual materials to confirm.Then define:signal / ground / power rolesand each dielectric thickness.Engineering illustration, not to scale. Reference geometry is not a released manufacturing stackup.