Alignment additivity of the superdeformed (SD) bands in odd-odd nuclei Tl-1
94 and Bi-196 is investigated with the level spins determined by the Cranki
ng Bohr-Mottelson Model. The alignments of four of the six SD bands in Tl-1
94 can be accounted for from the additive contributions of SD bands of the
neighboring odd-proton and odd-neutron nuclei, while that of the SD band Bi
-196(1) can not.