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