Angle-resolved photoemission data at (a) hν = 65 eV and (b)(h) 62 eV as a function of binding energy and emission angle for (a) a pure W(110) surface and (b)(h) for 215 ML of Al on W(110). The labels I| and I|| indicate interface states formed at thicknesses of 2 and 3 ML. The label SS corresponds to an Al(111)-derived surface state, and labels from 1 to 4 correspond to QWSs. The data are presented in the form of the first derivative of the photoemission spectra. The borders of the W surface-projected energy gap are marked by dotted lines, and expected W 6p dispersions are marked by two straight dotted lines.
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