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We have theoretically studied the azimuthal angular dependance of surface and bulk plasmon losses in Al 2s photoemission spectra. Here, full multiple scatterings of photoelectrons are taken into account before and after plasmon losses within the quantum Landau formula, which can describe overall features of the photoemission bands. By considering elastic scattering, the azimuthal angular dependence can be evaluated. Two types of peaks are observed; strong peaks attributed to forward focusingdoi:10.1380/ejssnt.2016.73 fatcat:tpu7dtbk3bc3jfbrgcswkqm4s4