Abstract: In usual measure coordinates, the four kinds of polarized Raman scattering intensities for ultrathin films can be expressed only by the Raman scattering activities of the membrane coordinate if the measure coordinates are overlapped with the membrane coordinate.Otherwise, the average values for the quadric cross terms of Raman tensor elements in the membrane coordinate may appear in some intensity expression.In the article, these average values were given under the uniaxially oriented model with a fixed angle.And all of the average values of quadric terms of Raman tensor elements in the membrane coordinate were giien under uniaxial orientation distribution model.

Key words: Molecular orientation, Raman scattering activities, Two-dimertsional condensed system