One could imagine to use 1 layer while the other is cooling, then switching when the current layer get too hot? But I guess the heat from 1 active layer would q

One could imagine to use 1 layer while the other is cooling, then switching when the current layer get too hot? But I guess the heat from 1 active layer would quickly propagate to the whole chip. Or maybe using more transistors allow to run them at a lower power to complete the same work, which reduces the dissipated energy ?