  We explore the morphological stability during the growth of strained
multilayer structures in a dynamical model which describes the coupling of
elastic fields, wetting effect, and deposition process. We quantitatively show
the significant influence of the wetting effect on the stability properties, in
particular for short-period multilayers. Our results are qualitatively similar
to recent experimental observations in AlAs/InAs/InP(001) system. We also give
predictions for strain-balanced multilayers.
