I ask because post-alveolar r could not be used after dental θ. My intuition tells me that it should be alveolar r, but I have not found on the Internet any confirmation for it.
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you could try listening to some words on forvo.com– JimNov 5, 2019 at 18:29
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2A more interesting question is whether it's voiced or not.– John LawlerNov 5, 2019 at 20:49
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I believe only (some) Scots ever have an alveolar tap there today. For everyone else it's just a squishy approximate. There used to be some other dialects 50+ years ago where you had a bit of that, but I don't know that anyone still speaks them.– tchrist ♦Nov 6, 2019 at 3:09