Where can I obtain the matrix layout of keyboards?

Question

Hi,

I'm designing a system where some of the commands require multiple key presses (in order to avoid accidental execution of certain commands). However, in order to do that in a way that will avoid keyboard jamming, I want to select the key combination according to the matrix layout of the keyboard (All the systems will have the same keyboard model).

Anyone knows where I can obtain the matrix layout of keyboards (by model)?

Thanks!