Took a PCB (From an old wireless phone) and cut through it and roughly polished on emery paper, and then gave a slight polish with 10?m and 2 ?m diamond paste.
First one is a small stack & stitch of a through-PCB copper plated via taken with epi-DF 5x NeoDplan
And this is a smaller area shot with 20x BF (24 image stack)
PCB Cross-Section
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