We report on the magnetotransport properties of a single-crystalline s
emiconducting beta-FeSi2 layer for the first time. A single-crystallin
e 5000-Angstrom-thick beta-FeSi2 layer was prepared on Si(001) by a tw
o-step reactive deposition epitaxy (RDE). Magnetotransport measurement
s showed the occurrence of anomalous Hall effect and negative magnetor
esistance in the beta-FeSi2 layer below 77 K. The Arrott plot indicate
d the possibility that the single-crystalline beta-FeSi2 exhibits ferr
omagnetic behavior below 15 K.