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...a largish diameter of perhaps 1/4" [thickness]?
As an exemplar, yes. Mylar or aluminum foil would be reflective, it all comes down IMHO to the supporting structure. Maybe 3mm stainless steel? Buffed Polymetal?
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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