The surface morphology of coalesced latex films is a key parameter for understanding coalescence processes and physical and chemical properties of the resulting films. These studies focus on molecular aspects of colloidal film surfaces. Specifically, the distribution and orientation of a commonly used surfactant, sodium dodecyl sulfate (SDS), in films obtained from colloidal dispersions of poly(styrene/ethylhexyl acrylate/methacrylic acid) (Sty/EHA/MAA) and the effect of covalent and ionic entities incorporated into these films are examined. Apparently, the presence of covalently bonded species, such as diacetone acrylamide/adipic dihydrazide (DAAM/ADDH), or ionic species, such as Ca(OH)2/NH4OH, can effectively immobilize or mobilize SDS molecules during coalescence. Furthermore, molecular orientation of SDS is also influenced causing structural rearrangements near the film−air (F−A) interface. Upon coalescence at 25 °C, the −SO3-Na+ moieties take a preferentially parallel orientation, whereas at 60 °C th...