Voicing of Minor 6

Drop 2 III

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Left hand
C3
Right hand
C4G4A4Eb5
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Drop 2

The Drop 2 III voicing of Cm6 stacks C, G, A and Eb from the bottom up: the root, 5th, 6th and minor 3rd 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 Cm6 are Drop 2 I, Drop 2 II and Drop 2 IV.