For the short reports- Template for preparing your Brief Report submission to PNAS using Overleaf: www.overleaf.com/latex/templates/template-for-preparing-your-brief-report-submission-to-pnas-using-overleaf/njbppqsnnfrn is the best choice.
For formal reports- Template for preparing your research report submission to PNAS using Overleaf: https://www.overleaf.com/latex/templates/template-for-preparing-your-research-report-submission-to-pnas-using-overleaf/fzcbzjvpvnxn is the best choice.