Samsung first used ultra-thin tempered glass (or UTG) in the Galaxy Z Flip, which was supplied to it by the German company Schott. Now, a Korean media outlet claims the OEM has turned to Corning instead for analogous flexible protection that is to be incorporated in its true next-gen smartphone/tablet flagship, the Fold 2.
https://www.notebookcheck.net/Samsung-reportedly-switches-to-Corning-for-the-Galaxy-Fold-2-display-s-glass-solution.469611.0.html
...This seems to suggest that the glass would be without a polymer protection layer...I'm skeptical.