PubMed raw data is hosted on the NCBI servers which provide convenient access using rsync.
Download PubMed baseline data using a rsync command like
rsync -Pav ftp.ncbi.nlm.nih.gov::pubmed/baseline/\*.xml.gz Pubmed/
This example command will download all baseline data files as .xml.gz to the PubMed folder
You can explore the PMC directory structure by accessing the NCBI FTP server using your browser.