transfer this appendix to general appendices

https://github.com/mtorresl-works/TORRES_thesis_manuscript/blob/1d341cdeb3ab1b758f02ec20b5e65a6348ac53d6/chapters/chapter-4.tex#L262


%\eeq

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\section*{Appendix: twist elastic resistance of thin hard needles}

For   hard rods  a tractable analytical expression for the $z-$resolved excluded area is available in the needle limit $L/D \rightarrow \infty$ [Poniewierski, Shundyak]:

mtorresl-works / TORRES_thesis_manuscript

transfer this appendix to general appendices #21