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I would like to write $R^{(2)}$ and use this as a FrameLabel. This means that I specifically want () around the 2 in the exponent. I've tried using

ToExpression["$R^{(2)}$", TeXForm]

but this produces only the 2 in the exponent with no parantheses. Thank you for any help and merry christmas!

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    $\begingroup$ Plot[x, {x, 0, 1}, Frame -> True, FrameLabel -> {x, R^"(2)"}] $\endgroup$
    – Bob Hanlon
    Dec 23 '19 at 16:46
  • $\begingroup$ Interesting, the answer here: mathematica.stackexchange.com/questions/140336/… does not seem to solve the problem (note: instead of converting to string, convert to traditional form to preserve superscript). Mathematica still removes the brackets. There needs to be a direct way of converting from TeXForm to String, but if you're only doing it for the label, then the solution above is better. $\endgroup$
    – user55405
    Dec 23 '19 at 18:44
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The solution offered by Bob Hanlon in his comment certainly works:

Plot[x, {x, 0, 1}, Frame -> True, FrameLabel -> {x, R^"(2)"}]

plot1

but, on MacOS at least, I think Mathematica renders the exponent of $R$ in too large a font. To fix this perceived fault, I suggest the following variation:

Plot[x, {x, 0, 1}, Frame -> True, FrameLabel -> {x, Superscript[R, Style["(2)", 6.5]]}]

plot2

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