Highly Conformable Conducting Polymer Electrodes for In Vivo Recordings A photolithographic process was used to integrate the conducting polymer poly(3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT:PSS) with parylene C, yielding highly conformable electrode arrays that were only four micrometers thick (shown here to conform to the midrib of a small leaf). The arrays were sufficiently self-supporting to allow in vivo evaluation in rats, yielding high-quality electrocorticography recordings.