in the last part of the paper, we derive the euclidean equation of motion of the magnetic vector in a theoretical magnetic film consisting of biaxial-anisotropic molecular ferromagnets, which is reduced to the 2 + 1 dimensional sine-gordon field equation in the strong anisotropy limit . we obtain various domain structures which are the static solutions of the sine-gordon field equation 最后考虑由双轴各向异性分子磁体形成的理想无界膜,在强各向异性极限下,采用半经典近似方法,将磁化矢量的时空运动方程约化为2+1维sine-gordon场方程,从而得到各类畴结构。