An infrared microscope operable in {TAIL ~ either a transmission mode} or {HEAD ~ a reflectance mode}, comprising: 
An infrared microscope operable in { TAIL ~ either a transmission mode } or { HEAD ~ a reflectance mode } , comprising :
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH