  The microscopic analysis of experimental data in $^{160,162}$Tm is presented
within the two-quasiparticle-phonon model. The model includes the interaction
between odd quasiparticles and their coupling with core vibrations. The
coupling explains naturally the attenuation of the Coriolis interaction in
rotating odd-odd nuclei. It is shown that the competition between the Coriolis
and neutron-proton interactions is responsible for the signature inversion
phenomenon.
