We propose to make use of neutron wave guiding effects to enhance interfacial sensitivity and study the spin texture of individual interfaces between ferromagnetically doped topological insulator layers and ferromagnetically doped topological insulator and antiferromagnetic layers. By making use of magnetic wave guiding effects we will greatly enhance the sensitivity of the neutron measurement to small interfacial effects. Topological insulators are one of the most important recent discoveries in condensed matter physics and gaining control of the surface state by introducing a band gap is crucial for their potential application in new types of electronics devices but also allows the appearance of new quantum phenomena.