Although the ferromagnetic Heusler type (B1b) PtMnSb phase exhibits a large magneto-optical Kerr rotation effect, it is usually hard to obtain the perpendicular magnetic anisotropy in this film because of its small crystalline anisotropy. On the contrary, the ferrimagnetic phase of Mn2Sb, whose crystal structure is the Cu2Sb type (C38), shows uniaxial magneto-optical anisotropy above 240 K, but its magneto-optical Kerr rotation effect is not so large. Accordingly, if the films consisting of these two phases (PtMnSb+Mn2Sb) are produced under texture control, one could find many interesting properties for the applications of film. Recently, we have successively fabricated this kind of two-phase films by solid-state reactions of Pt/Mn/Sb multilayers. However, the texture control, which is important for obtaining the perpendicular anisotropy, has been still remained as an unsolved problem. In this work, we have focused our attention on the possibility to control the preferred orientation of the Mn2Sb phase by changing the stacking pattern of multilayers, deposition conditions and postdeposition treatments. The two-phase films consisting both PtMnSb and Mn2Sb were prepared by annealing the Pt/Mn/Sb multilayer having the stacking pattern [{Pt(1.0 nm)/Mn(2.5 nm)/Sb(2.5 nm)}1/{Pt(0.0 nm)/Mn(2.5 nm)/Sb(2.5 nm)}2]20. Whereas, the single phase of PtMnSb was obtained after annealing the multilayer of [Pt(1.2 nm)/Mn(2.4 nm)/Sb(2.4 nm)]60. The difference in the phase evolution may be ascribed to the microstructure developed near the interfaces by interdiffusion. Hereby, we have prepared the Mn/Sb bilayer and observed in detail the interdiffused area by transmission electron microscopy.