I can't answer for PHD2, but for the Ekos internal guider, the stages are (1) increment RA, (2) decrement RA, (3) increment DEC, (4) decrement DEC.
It's probably similar for PHD2, however to be sure you can find out by just letting it calibrate and watching the mount's reported RA and DEC angles (e.g. in the Ekos mount tab).
That is, in the RA stages you should see the DEC stay the same and the RA change consistently in one direction when going out and the other when coming back in.

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