Ni²⁺ can form tetrahedral and square planar complexes having a formula of NiX₂L₂, where X is Br^– or CN^– and L is the monodentate ligand triphenylphosphine (PPh₃). Give the possible structures for each NiX₂L₂ complex and identify which will have a net dipole moment, considering that NiBr₂L₂ is paramagnetic and Ni(CN)₂L₂ is diamagnetic.