The internal mixing of inorganic salts, secondary organic matter, and surfactants is ubiquitous in tropospheric aerosols. Our study shows that the presence of surfactants alters the spreading coefficients of the organic and inorganic phases. Therefore, the phase-separated particle morphology can shift from the conventional core-shell structure to partial engulfing configurations, or even to inverse core-shell forms where the organic phase is surrounded by an outer inorganic shell.