Related to the past level, the impedance of any signals on L4 will have scaled-down deviations close to power rail splits on L3 Dedicating a single layer to power lets you split up the aircraft into rails to ensure that multiple voltages can be employed at high latest if needed. https://12-layer-automotive-centr50593.ezblogz.com/62978222/the-single-best-strategy-to-use-for-rogers-high-frequency-board-pcb