Voicing of Ab Dominant 7

Drop 2 II

Back to Ab7

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Left hand
Ab2
Right hand
Gb3C4Eb4Ab4
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Drop 2

The Drop 2 II voicing of Ab7 stacks Gb, C, Eb and Ab from the bottom up: the minor 7th, major 3rd, 5th and root of the chord.

It's one of the Drop 2 voicings: four-note chords in close position with the second note from the top dropped an octave, played over the root. The others for Ab7 are Drop 2 I, Drop 2 III and Drop 2 IV.