Directing a high-speed, high-temperature, seeded jet generated by a micro-combustor past the concave side of a ’cold’, platinum circular foil whose temperature is actively controlled, we investigate the simultaneous action of inertial and thermophoretic effects on particle deposition from curved, laminar boundary layer flows. Although particle Stokes numbers in these experiments are of O(10(-2)), much smaller than the values customarily thought to signal the onset of inertial effects, we observe a significant increase of particle deposition rates over those expected based on ’pure thermophoresis’ theory, in agreement with a recently developed theory of inertially modified thermophoresis in such flows.