Watch the 2+4 = 6/9 online guitar lesson by Brad Carlton from Chord Studies: Open String Chords Vol. 1
Here’s a great example for how to use structures that involve 2nds and 4ths in voicings that move all around the neck. You’ll want to take a moment to analyze the harmony in play here. These are all sweet 6/9 voicings and you’ll find many opportunities to pull these babies out for optimal texture.