Nifty topic.
This link should help clarify the pane construction.
The metals used for UV protection and heat containment are highly conductive and reflective, depending on the application, to various forms of energy.
Try wrapping your family room in aluminum foil for fun for a month and see what happens. The results are fascinating. Best under the chin sun tan ever!

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"Those who preach the myths of audio are ignorant of truth."