Apparatus for interference patterning of a planar sample including a laser and a focusing arrangement positioned in a beam path of the laser so that the laser beam is imaged in a first spatial direction in a focused manner into a sample volume in which the planar sample is positioned. A laser and telescope associated with a Raman sensor are mounted on the robot arm in such a way as to point in substantially the same direction in which the camera is pointed. , and a fluxing curing agent comprising a fluxing curing agent comprising: a hydroxyalkyl-substituted tertiary amine, and at least one diacid compound represented by the formula:HO2C\u2014Z1\u2014CH2CH2CH2\u2014Z2\u2014CO2Hwherein Z1 and Z2 independently represent a covalent bond or an aliphatic hydrocarbylene group. The members diverge upwardly from one another from the pouch to their respective fastener components. Each cover includes a generally radially inwardly directed projection received in an indentation formed in an outer surface of the shaft to lock the cover axially and rotationally with respect to the shaft. The terminal group further includes a hollow opening at a rear end.