The field of magnetism in ultrathin metallic structures is one of growing importance, from both technical and fundamental viewpoints. The rapid development of this field has generated an urgent need for a single treatment which can serve as an introduction to the field for those entering it from a diverse range of backgrounds in the physical sciences but which will also serve as a timely overview for those already working in this area. In this volume, the second of four, a very thorough discussion of the important subject of magnetic anisotropies, coupling and giant magnetoresistance is given, and the reader is introduced to RF techniques, the Surface Magneto-Optic Kerr Effect, and Mossbauer Spectroscopy techniques used to probe these properties.