Copper foil, a kind of negative electrolytic material, is deposited on base layer of PCB to form continuous metal foil and is the conductor of PCB.
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News - The Role of Copper Foil in the Circuit Board Industry
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Advantages of Laser Microscopes for Measuring the Roughness of Copper Foil used in 5G PCBs, Blog Post
a) The copper foil is connected to the PCB GCPW ground, and (b) the
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PCB design copper foil thickness, wire width and current relationship - Kingford
Introduction of high frequency high speed materials for 5G circuit board. - PCBSky
Exfoliation of coarse printed circuit boards using dimethylacetamide: Production of copper concentrates - ScienceDirect
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What is CCL? : CCL(Copper Clad Laminate) : Products : Doosan Corporation Electro-Materials