Coated soot aerosols pose cardiovascular and pulmonary health risks and are among the least understood contributors to climate change. This project aims to measure the total extinction and polarization-resolved differential scattering cross section of soot particles, and to study how these optical properties are affected by transparent coatings similar to those found on atmospheric soot particles. We report cavity-ringdown and angle-resolved scattering measurements of soot particles created in an ethylene flame and coated with layers of oleic acid.