https://stackoverflow.com/questions/501723/overlay-one-pdf-or-ps-file-on-top-of-another
You can do this with pdf files using the command line tool pdftk using the stamp or background option.
e.g.
$ pdftk file1.pdf background file2.pdf output combinedfile.pdf
This will only work with a one-page background file. If you have multiple pages, you can use the multibackground command instead.
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