Now, if you add a second signal layer in between the two ground planes, one
in the X direction and the other in the Y, you still have stripline
(asymetric), but now you have a bunch of traces crossing the path above (or
below) your signal layer. I understand this introduces crosstalk, but what
does it do to the characteristic impedance of your traces? Is the impedance
still controlled? Does it vary widely, or not have much effect at all?
I see a lot of stackups with this arrangement, and I wonder how Zo is
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