Lexan is polycarbonate. Polycarbonate could be Lexan, Makrolon, or other trade names.
Acrylic, such as Plexiglas, is easier to form than polycarbonate. Polycarbonate should be baked in an oven at 200 deg F for at least an hour to remove dissolved moisture. Otherwise, it may form bubbles when you try to heat form it.
Get a heat gun that has at least two heat levels. Continuously variable heat is not necessary. Heat guns are cheap. Just buy one.
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