A coupled channels analysis is performed for 180MeV antiproton scattering on I2C with two branches of coupling, 02 + 2+ + 0; and 0; -O;, included. Electron scattering form factors and shell model densities are folded with a g-matrix to generate the generalized optical model potentials. The vital importance of multistep processes is shown for the explanation of data.* The reduced radii are erroneously multiplied by 12' ' instead of 11' ' in Ref.[3] and must thus be multiplied by (11/12)" = 0.971 to be comparable with the present values.