A multi-phase partial response receiver supports various incoming data rates by sampling PrDFE output values at a selected one of at least two clock phases. Free outer ends of the flexible arms are provided with hook-shaped parts which are used to couple to a paint tin. Preferably, the focal point is moved relative to the sample without disrupting the Gaussian beam profile of the scanner. A third arm member including a third extension member having an arcuate shape extending therefrom is interposed between the first and second arm members. A second region of doped silicon located below the sacrificial layer is resistant to the chemical etch performed to remove the sacrificial layer, and thereby renders the bottle trench formation process self-limiting.