Here are the pictures of layer stackup for 4 layer pcb and 6 layer pcb boards for standard 1.6 mm boards. I got them from one PCB manufacturer. By these pictures, I could clearly know prepreg material and thicknesses of each layer. It seems that I can also calculate trace widths, right?
David
2017/4/11 14:05:42
Clear pictures, yes, you can!