This article [J. Micro/Nanolith. MEMS MOEMS 11(3), 033010 (2012)] was originally published online on 21 September 2012 with an error on page 6 in the Discussion section.

A series of numbers was misprinted as (0, $\pi /3$, $2\pi /3$, $\pi$) while the correct form is (0, $\pi /2$, $\pi$, $3\pi /2$). All online versions of the article were corrected on 18 June 2013.