How can I print two layers (top.Gbr gko.gbr) on a single A4 paper

[abpyu]

How can I print two layers (top.Gbr gko.gbr) on a single A4 paper, superimposed on top of each other instead of printing separately?

Gerber2pdf -output="My_Project.pdf" -page_size=A4 -colour=255,0,0 C:\G\top.gbr -combine -colour=0,0,255 C:\G\gko.gbr