It's not a usual measure in my opinion. Where do you see it?One thing I don't understand is power to power bypass capacitor.
The truth is, you can't arbitrarily choose a return path. The return current will split to both planes. By deciding to layout a power supply node as a plane, you make it suffcient low impedant to "attract" return currents of adjacent signal traces like a ground plane. A power plane with many distributed bypass capacitors to ground can play this role in most cases. But you have a problem with high level, single ended digital signals, e.g. clocks. They will at least excite some standing waves at the planes and may cause radiated emissions elsewhere. To get completely rid of it, you would need to have the signal embedded between two ground planes and via fences all along the trace.The return for layer 3 signal would be GND (layer 2) or PWR (layer 4)?
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