I am attempting to use the toner transfer method to etch a two layer pcb. I have practicing different ways to make sure the two sides are lined up before applying the iron to it. I suddenly realized that things weren't looking right and I think I may have the wrong layer photocopied as a mirror image. When working with a 2 layer pcb, which layer is typically the top layer (the one with the components sticking up) and which layer is the bottom layer (the one with the component leads sticking up which would also be the side that you solder the component leads to the board)?