WASP-189b has atmospheric layers, just like Earth. (Which all planets probably do).
But it's a hot Jupiter and the layers of its atmosphere are metals. It even seems to have an ozone layer made of titanium oxide.
(Sadly, the full paper is paywalled so I can't really give more). Again, though, it's likely all atmospheres do this, this one just transits so nicely we were able to see it.
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