Fix for line between last section and bibliography (Latex Revtex4-2)

## Ugly line before bibiliography rather than the 'references' header:


To fix add this line to your preamble `\def\bibsection{\section*{\refname}} `

Fix from [stackexchange](https://tex.stackexchange.com/questions/246120/latex-ugly-line-above-references)

Start by locating the LaTeX document and its preamble; no repository file is named in the issue. Review the linked StackExchange explanation and compile the RevTeX4-2 document after applying the documented preamble change. Done means the line before the bibliography is replaced by the “References” header.

Written by the indexing model from the issue text.