We have investigated the magnetic properties of a dot array that contains t
wo nonidentical dots per unit cell. As expected, this structure produces a
diffraction pattern consisting of intense and weak spots that results from
in- and out-of-phase contributions of the two sublattices. A comparison of
the magneto-optical Kerr measurements on the weak and strong diffraction sp
ots enables the switching of the two sublattices to be determined independe
ntly.