Issue link: https://iconnect007.uberflip.com/i/1453746
FEBRUARY 2022 I PCB007 MAGAZINE 55 Controlled Surface Etch A less popular method (controlled surface etch or copper thinning) starts with one-half or one-ounce foil and thins the copper to a lower thickness via etching. As an example, one can reduce one-half ounce copper foil layer to one- quarter or one-eighth ounce through cupric chloride or alkaline etching. is seems easier than trying to work with super thin foils from a handling perspective. An advantage of copper