[en] One of two known forms, M_r=622.1, tetragonal, I4₁/acd, a=7.461 (2), c=14.804 (2) A, V=824.1 (6) A³, Z=8, D_x=10.03 Mg m^-3, λ(Mo Kα)=0.7107 A, μ(Mo Kα)=35.72 mm^-1, F(000)=2144, T=298 K, R=0.051, 613 unique reflexions. Synthesized by induction heating. Isostructural with (RE)Ru₄B₄ (RE=rare earth). In contrast to the atomic arrangements of the other form, primitive tetragonal, Rh atom tetrahedra are rotated by 7⁰ around the c axis and B atom tetrahedra are rotated in the same direction but by a slightly smaller amount (5⁰). The shortest connexion between Rh atoms forms zigzag chains running parallel to the a₁ and a₂ axes. (orig.)