Mixed Cations and Structural Complexity in (Eu\\r sub/\\r 1−\\r ixi\\r sub\\r Ca\\r sub/ixi\\r sub\\r )\\r sub/4sub\\r In\\r sub/3sub\\r Ge\\r sub/4sub\\r and (Eu\\r sub/\\r 1−\\r ixi\\r sub\\r Ca\\r sub/ixi\\r sub\\r )\\r sub/3sub\\r In\\r sub/2sub\\r Ge\\r sub/3sub\\r —The First Two Members of the Homologous Series A\\r sub/\\r 2[\\r ini\\r +\\r imi\\r ]\\r sub\\r In\\r sub/\\r 2\\r ini\\r +\\r imi\\r sub\\r Ge\\r sub/\\r 2[\\r ini\\r +\\r imi\\r ]\\r sub\\r (\\r ini\\r ,\\r imi\\r = 1, 2, ...∞; A = Ca, Sr, Ba, Eu, or Yb)