To know maximum depth from which evaporation can take place, we need to calculate the Knudsen layer thickness (Google it if you want the equation). I calculated it for water and got 00 nm (0e-0 m) thick. It should be noted that this is an entirely new length regime compared to everything else discussed so far...it is far smaller than even the "minute" distances waved around by those saying LWIR can't heat water.