Print substrate surface modification

A method comprising:

• determining a surface resistivity of an electrically conductive top layer of a print substrate;
• comparing the determined surface resistivity to a print range having a lower threshold value for the surface resistivity of the print substrate and an upper threshold value for the surface resistivity of the print substrate;
• in response to the determined surface resistivity of the electrically conductive top layer being outside the print range, selecting a doping material to adjust the surface resistivity of the electrically conductive top layer to fall within the print range, wherein the doping material comprises polyethyleneimine or an ethylene acrylic acid;
• and
• doping the electrically conductive top layer of the print substrate with the selected doping material.

A method comprising:

• determining a surface resistivity of an electrically conductive top layer of a print substrate;
• comparing the determined surface resistivity to a print range having a lower threshold value for the surface resistivity of the print substrate and an upper threshold value for the surface resistivity of the print substrate;
• in response to the determined surface resistivity of the electrically conductive top layer being outside the print range, selecting a doping material to adjust the surface resistivity of the electrically conductive top layer to fall within the print range, wherein the doping material comprises an anti-static agent that comprises an ionic liquid or a solid state salt;
• and
• doping the electrically conductive top layer of the print substrate with the selected doping material.