I am using a couple of SMPSs (MPM3610) on a 4 or 6 layer PCB. The recommended PCB layout seems to use solid copper regions to connect the design together.
Should thermal-reliefs be used on the capacitors and resistors? Does it have any effect on performance of a SMPS circuit?
On multi-layer boards, should unused layers underneath the power circuit remain empty, GND filled, or it doesn't matter?