Kurtosis is a measure of the peakedness or sharpness of the surface. The digital representation of this parameter is displayed below.
A Gaussian surface has kurtosis value of 3. A surface that is centrally distributed has a kurtosis value greater than 3. A surface that has a well spread out distribution has a kurtosis value of less than 3. By using a combination of the skewness and kurtosis values, it is possible to identify plateau honed surfaces that have relatively flat top, but contains deep valleys.