This book focuses on studying the growth, properties and applications of inorganic, organic and molecular thin films. Inorganic thin films are important for semiconductor circuits, photovoltaic devices and protective coatings. Organic thin films play a critical role in chemical sensors, optical liquid crystal displays and in surface chemistry on atmospheric aerosols. Molecular solid films are essential in understanding heterogeneous atmospheric chemistry on cloud and aerosol particles. This book brings together new and exciting research in this field.