  The origin of the identical gamma-ray energies (IB) observed in the
K=33/2$^+$ and K=16$^+$ bands in $^{177}$Lu and $^{178}$Hf respectively is
investigated using deformed Hartree-Fock and Angular Momentum Projection
technique. We find that quantised orbital (rather than spin) alignment of
protons in the m=1/2$^+$ inert orbit leads to identical energy spectra. A
K=16$^+$ band with identical spectrum is predicted in $^{176}$Yb at 4.48 Mev of
excitation.
