These compounds may be in {HEAD ~ a crystalline state} having {TAIL ~ metallic cations} of two different valences, or electronic states, in the inorganic crystal 
having
These compounds may be in { HEAD ~ a crystalline state } having { TAIL ~ metallic cations } of two different valences , or electronic states , in the inorganic crystal
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH