“…These include studies of models with intermediate phases [5,10,14,15], dependence on pulling directions [16], models with additional features like semiflexibility [17], heterogeneity [9,18,19,20,21], saturation of hydrogen bonding [22], random forcing [23] etc. A similar problem of unzipping of an adsorbed polymer from the surface has also been studied [24,25]. Experimental studies use various micro-manipulation techniques [26,27,28].…”