Angle‐resolved ultraviolet photoemissionspectroscopy (ARUPS) has been used to study the p(2×1) oxygen‐induced reconstruction of Cu(110). While there is agreement between experimental groups that the O atoms sit in the long‐bridge site along the 〈001〉 Cu directions, there are two proposed models for the reconstruction: the missing‐row model, in which alternating 〈001〉 rows of Cu atoms are missing, and the buckled‐row model, in which the O‐containing 〈001〉 rows are displaced outwards from their bulk position. Our ARUPS data show oxygen‐induced changes in the Cud‐band photoemission features that are inconsistent with the missing‐row model, thus favoring the buckled‐row picture. In addition, the O–Cu bond appears to be highly directional and oriented along the 〈001〉 Cu rows, consistent with O sitting in the long‐bridge site. Moreover, the O–Cu bond is primarily a result of the O(2p x y )–Cu(3d x 2−y 2 ) interaction.