SonicCulture
RareBird
From what I've seen most people don't go to this bother. Flip the phase and see which way sounds best. Guys will then Highpass the one they use for click (91) and low pass the low one ( beta52). Or at least something close to that with the available EQ.
Personally if things start sounding weird and phasey after this I revert to using 1 mic.
Analog wise i only use one mic becourse i cant do this trick, but i dont really see it much as a bother more as a help. I think the result is a punchier and much tighter kick drum.
But diffrent minds diffrent mixes, maybe im just being picky.