A texture of circular concentric disclination walls is produced in a smectic C* free standing film on applying an in-plane ac electric field. Intensity light profiles taken in the radial section of the circular walls allows us to evidence modulations of the tilt of the molecules. These molecular tilt angle modulations are due to a new elastic term K*c(2)(rote).N in the free energy. We deduce the linear bend constant K*, which originate from the chiral property of the system. We find K*/b similar to 2.5 mum.