As always Ainar, I think you are right. I was considering the the metallic coating (in confused way) as just the heating element whereas it is more complicated than that when taking into account the IR heat refective capability of the windscreen. That coating would, I would have thought (another assumption, Andrew  ) be over the whole window.
Looks like a repeater is the answer.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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