[O] superscript footnote number underlined?

[Sharon Kimble]

How can I have the footnote number in an org-mode file, exported to
latex and then built as a PDF file, be underlined please? I'm finding
them very difficult to see when the page is printed in black on white,
and I'm hoping that underlining the superscript footnote number will
make it stand out more from the rest of the text.

Thanks
Sharon.
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