Thin mica shows semiconducting behavior, say scientists in new study

https://phys.org/news/2022-07-thin-mica-semiconducting-behavior-scientists.html

"semiconducting MuM flakes... electrical conductivity that 1000 times larger than that thick MuM... exfoliated thin MuM flakes.. onto silicon (SiO2/Si) substrates... avoid tunneling, maintained  separation 1 µm between contact electrodes... transition to conducting state gradually as flakes were thinned down fewer layers... MuM flakes below 20 nm, the current depended on the thickness, becoming 1000 times larger for a 10 nm thick MuM (5 layers thick) compared to that in 20 nm MuM"