I prefer "a single-layer film", and I think it should be hyphenated.
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AnonymousHow do you decide when to put that "-ed" at the end of the last adjective? A long ago, I think I was taught the 'three-storied" is correct but now I see "three-story" in sentences and people seem to take it as correct. Does it subject to trends?
three-storied (three-story??)building
muti-colored (multi-color??) clothes
stone-washed (stone-wash??)