TABLE 1.

Roughness measurements calculated by SPIP^TM from the AFM topography images.

Polymer type		Average roughness Sa (nm)	Root mean squae roughness Sq (nm)	Surface skewness Ssk (nm)	Surface kurtosis Sku (nm)	Peak to peak Sz (nm)
PET	Unconditioned	2.6	4.9	3.9	137.8	376.0
	24-h conditioning	2.9	6.9	13.4	389.7	537.2
PLA	Unconditioned	9.8	15.7	−2.2	9.6	506.8
	24-h conditioning	12.9	19.6	−1.7	10.3	425.1

The PET and PLA cards were exposed to seawater for 24 h and the measurements were done in Milli-Q water.