All of the stuff below is by Russ Ferrente, from "Jellow Jackets".
Polychrds: Two major triads a 5th apart.
Rule: Drop doubled notes.
Ex: Lh/Rh
C/G for CMaj7 or Amin11.
1st Inversion: E-B/C-D-G
2nd Inversion: G-C/D-E-B
Open position voicings: (Doubling Permitted)
Ex: C/G C starts two octaves below middle C.
C-G-E/B-G-D
Ex2: Dm/Am D starts two octaves below middle C.
D-A-F/A-E-C
*I encourage you to explore and find your own combinations of POLYCHORD!!!