Concept stackup: 8 / 2 / 2 / 8 ozConcept stackup: 8 / 2 / 2 / 8 ozL1: nominal 8 oz power copperCured dielectric: to be agreedL2: nominal 2 oz copperCore dielectric: to be agreedL3: nominal 2 oz copperCured dielectric: to be agreedL4: nominal 8 oz power copperCopper alone ≈ 0.70 mm. Add dielectric and tolerances.A symmetric label sequence does not prove copper-density balance.Conceptual engineering illustration · Not to scale · Not production evidence