[SI-LIST] Split Plane Routing

Hello all,

Given the following stackup with planes split in different areas - 

1 - S1
2 - GND (SPLIT 1)
3 - S2
4 - GND(SPLIT 2)
5 - POWER(SPLIT 3)
6 - S3
7 - GND (SPLIT 4)
8 - S4.

For a signal which originates on layer 8, should the signal only be
routed on layers 6 & 8? Or, can layers 1 and 3 also be used to cross
a plane split on layer 7, assuming layers 2 and 4 are not split in the 
same place (z axis)?

Thanks in advance,
Pat

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