Watch the No Third online guitar lesson by Brad Carlton from Chord Studies: Flamenco Chords Vol. 1
The first voicing is an E7b9 with no third. What we're doing here is putting the E and the F note side by side, emphasizing that minor second interval that gives us that flamenco sound. Try leaning forward just a little bit and dropping the shoulder if you're having trouble getting the stretched out voicings here.