Experiments on TFCDs have been recently carried out in order to explore the internal structure of TFCDs. TFCDs have been confined within a microchannel by Kim and coworkers . They have shown in particular that the formation of TFCDs is very much influenced by the channel depth. Another way to investigate the internal structure of TFCDs consists of the use of AFM study on Smectic A droplets either on coated silicon substrates  or on MoS2 substrates both with hybrid anchoring conditions (homeotropic anchoring with the air-interface and planar anchoring at the solid substrate) [17, 18]. Optical measurements of the birefringence permit the description of TFCDs in thin films of smectic A deposited on mica in air .