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et al. ; Spin polarization of a topological surface state for GeBi 2Te 4, the newly discovered three-dimensional topological insulator, has been studied by means of state-of-the-art spin- and angle-resolved photoemission spectroscopy. It has been revealed that the disorder in the crystal has a minor effect on the surface-state spin polarization, which is 70% near the Dirac point in the bulk energy gap region (∼180 meV). This finding promises not only to realize a highly spin-polarized surface-isolated transport but also to add functionality to its thermoelectric and thermomagnetic properties. © 2012 American Physical Society. ; This work was financially supported by Grant-in-Aid for Scientific Research Kiban A (Grant No. 23244066) and Kiban B (Grant No. 23340105) of the Japan Society for the Promotion of Science (JSPS). We also acknowledge partial support from the Basque Country government, Departamento de Educación, Universidades e Investigación (Grant No. IT-366-07), and the Spanish Ministerio de Ciencia e Inovación (Grant No. FIS2010-19609-C02-00). ; Peer Reviewed