It is my first time working on a 4-layer pcb design with PCIe golden finger. I have 2 voltage levels, 3.3V and 12V. I set the third layer to be the power plane. Does it mean that I have to always put my two power planes on this layer?
In my case, for 12V, all the connections can be done on the top layer. I am not sure whether I can just create a power plane 12V on the top layer. And if it is wrong, how can I make the connection between the top layer 12V connection with the third layer 12V power plane? It might seem a bit weird as I already make the connection on the top layer.