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X-ray reflectivity XR and atomistic molecular dynamics (MD) simulations, carried out to determine the structure of the oil/water interface, provide new insight into the simplest liquid/liquid interface. For several oils (hexane, dodecane, and hexadecane) the XR shows very good agreement with a monotonic interface-normal electron density profile (EDP) broadened only by capillary waves. Similar agreement is also found for an EDP including a sub-Å thick electron depletion layer separating the oildoi:10.1103/physrevlett.117.256102 pmid:28036213 fatcat:5kps3a7iz5gmfhcwlchcsw5kaa