When partially transparent samples are analyzed, the measuring cells having a reflecting surface (reflector) are used. Therefore, the reflection and transmission are both taken into account: this is called transflexion (or transflectance). In near-infrared (NIR), the measurement mode follows the principles of transflexion.
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the phrase cones from transmission - reflection -the light is incident on the sample, absorbed/transmitted, reflected by a highly reflecting substrate, and transmitted/absorbed by the sample again, and measured. It effectively doubles the sample thickness.
See for example
"Reflection contributions to the dispersion artefact in FTIR spectra of single biological cells",
Paul Bassan, Hugh J. Byrne, Joe Lee, Frank Bonnier, Colin Clarke, Paul Dumas, Ehsan Gazi, Michael D Brown, Noel W Clarke, Peter Gardner,
Analyst,134, 1171 - 1175 (2009)
"Transflection" is not a common terminology in spectroscopy, but it is limitedly used in a community of microscopic spectroscopy. When a reflection measurement is performed on a dielectric (nonmetallic) surface, the measurement is defined as "external reflection," and the spectrum should be with the unit of "reflection absorbance." Regardless, when the angle of incidence is small and close to zero, e.g. 10 degree, the measurement is sometimes called "transreflection" measurement.
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