Yes. I think they are plexiglas. They are the small ones in the rear passenger doors, and seem to be very hard to find.
They are in fact polycarbonate...similar material to the lens covers of the headlights.
It appears that few owners have managed to 'polish' out the scratches/blemishes of
these rear door quarterlight windows, but they can occasionally be made to look a little
better.
The suggested use of window 'film' or tint has never been successful as it does not
adhere at all well to the polycarbonate surface, but perhaps as suggested one could
cover the outer surface with sticky backed black foil/vinyl, although this would render
the quarterlights opaque.
For some owners that is far more preferable than seeing the badly scratched/blemished
polycarbonate.... other owners may have alternative ideas.