I need to design a 4 layer
board with a total thickness of 1.2mm. But I have no idea how can I stack up them together. But for a 200 ohm differential trace, there is no suitable trace width and gap. I want to know 50 Ohm single ended trace width and 100 Ohm differential trace width. Can you apply a single stack of 50 ohms and 100 ohms, 50 ohms and differential or single 200 ohms to me?