  A linear accelerator structure, such as will be used in the linacs of the
JLC/NLC collider, is composed of on the order of 100 cells. The cells are
constructed as individual cups that are brazed together to form a structure.
Fabrication error will result in slight cell-to-cell misalignments along the
finished structure. In this report we derive an approximation to the transverse
wakefield of a structure with cell-to-cell misalignments in terms of the
eigenfunctions and eigenvalues of the error-free structure.
