How to create a temperature gradient in thin wall and two dimensions
 

I would like to create a flat rectangular sheet metal that has one temperature gradient on the inside/outside, and another gradient along the top/bottom. In other words, I would like the inside top to be 100C, and the inside bottom 50C. I would also like the outside to be 10C less than what it is on the opposite side.

I'm trying to do this with solidworks simulation, and while I can get a gradient from top to bottom (using temperature definitions), I can't get the other gradient without using a heat flux (and I only know the temperature difference).

Has anyone needed to do this and how have you accomplished it? I am happy to give more clarifications if necessary.

Thanks all