Copper construction is more than copper weightRO4000 LoPro processing guidelines: Source & Enginee…. Engineering illustration, not a production photograph or test result.Copper construction is more than copper weightRO4000 LoPro processing guidelines: Source & Enginee…Conductor cross-section — conceptual surface profileDielectricProfile, treatment, thickness and finish need explicit definitions.This sketch is not a measured roughness trace or a foil comparison.