Stage 2: Evenly distribute a twist of π (T=1) in AO
basis
MOs occur in degenerate pairs: 2(α +
1.0β) and 2(α - 1.0β)
E. Heilbronner, Hückel molecular orbitals of
Möbius-type conformations of annulenes, Tetrahedron
Lett, 1964, 1923-1928. DOI: 10.1016/S0040-4039(01)89474-0
