3.1 INTRODUCTION3.2 GEOMETRY, ELECTRONIC STRUCTURE, AND REACTIVITY OF CLEAN SEMICONDUCTOR SURFACES3.3 GEOMETRY AND ELECTRONIC STRUCTURE OF H-TERMINATED SEMICONDUCTOR SURFACES3.4 GEOMETRY AND ELECTRONIC STRUCTURE OF HALOGEN-TERMINATED SEMICONDUCTOR SURFACES3.5 REACTIVITY OF HYDROGEN- OR HALOGEN-TERMINATED SEMICONDUCTOR SURFACES IN SOLUTION3.6 SUMMARYACKNOWLEDGMENTSREFERENCES