**4.** Reliability

Scanning probe lithography involves a set of lithographic techniques, in which a microscopic or nanoscopic stylus is moved mechanically across a surface to form a pattern. In this method, another technique describes a SPL technique which is known as Dip Pen Nanolithography.

Dip Pen Nanolithography - in this process, the patterning is done by directly transferring chemical species to the surface. We can call this process as constructive process.
