  We study stress relaxation in a strongly segregated lamellar mesophase of
diblock copolymers. We consider the extreme limit in which chains are highly
stretched and with their junction points confined to narrow interfaces. A
lamella can be divided into "stress blobs" at some distance $z$ from the
interface, with well defined local modulus $G(z,\omega)$ at frequency $\omega$.
For sliding (compressional) stress the total modulus is transmitted in series
(parallel) across the layer. We evaluate the local $G(z,t)$ which shows, for a
given height, a very broad spectrum of relaxation times.
