Which power cords have high resolutions and separation??

anything OCC single Crystal will be the best sounding power cord.

In my experience single core beats Litz everyday in terms of leading edge and impulse response. Think Acoustic Revive, Nordost. Also using an Add-Powr conditioner is a highly cost effective way of upgrading the supply side

Power cables do not affect audio quality 

+1 on Acoustic Revive, especially power sensual 18000 if you can stretch your budget (including good quality plugs).

Regular 16 gauge and 20 gauge cords.

Don't waste your money on anything else.

For power transmission and supply....wire is wire.