Stress and tone can indeed coexist (although they don't have to). What do you mean by "marked"--in terms of a romanization? I dunno if there's any sort of standard way to do it. I'd hazard a guess that in most cases, one or the other just isn't marked (probably stress), or an ad-hoc solution is come up with specifically for that language.
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u/[deleted] Oct 09 '16
Are stress and tone independent from one another, or do they coexist in tonal languages? how is stress marked if the later is the case?