Moreover, according to the DOS plot of Gd (100), the filled states near fermi level is contributed by the filled dx2-dy2 and dxy orbital. However, in GdTe (100) surface, the filled states near fermi level are mainly contributed by the dxz orbital (Figure ). This is because in GdTe the Gd atoms interact with the Te atoms by their dx2-y2 orbitals as confirmed by the electron accumulated blue region around Te atoms that is spread along the bond (Figure ).