Most research to date use self-assembled protein monolayers deposited on a conductive substrate as electrode contact. However, as protein monolayers are ultra-thin (generally, 10 nm, usually < 5 nm) relying on them leads to the nearly exclusive use of vertical junctions. Implicit in that choice is the problem how to make top contact to such films. Specifically, depositing top electrodes directly onto protein layers-without protective interlayers-mostly leads to damage, poor contact, high variability, and lack of stability of the junctions.