1. Introduction. 2. Calculations of the field near magnetized anisotropic layered media including backlayer and gap smear. 3. An alternative expression for the read flux in magnetic recording theory. 4. Further considerations concerning the alternative reciprocity theorem. 5. Sensitivity functions, gap loss functions and the efficiency. 6. Special and limiting cases of the general flux expression. 7. A simple model for unbiased sine-wave recording. 8. Video-head parameters: model and measurements. 9. Probe-type heads: models for efficiency and auxiliary-pole effect. 10. Cross measurements in magnetic recording: a new way of determining head performance. 11. Analytical description of thin-film yoke magnetoresistive heads. 12. Metal-in-gap heads. 13. Bandpass heads. Appendices. Subject index. Author index. Glossary of special definitions, symbols and notations.