The phrase "variations in thickness" is correct and usable in written English.
You can use this phrase when talking about differences in size or consistency between different objects. For example, "The variations in thickness of the wool fabric made it difficult to sew."
Despite its advantages over crown glass, broad glass had surface waviness and variations in thickness.
She said that because many fireproofing subcontractors do excellent work, she would be surprised if large variations in thickness, like gaps in the insulation, turned up in every building that was inspected.
Linear, sinusoidal and exponential variations in thickness of layers are assumed.
Effects of variations in thickness of dielectric layer H and structural parameters on the pass-band are surveyed.
Variations in thickness, morphology and GFP concentration of the films make precise specification of the two-photon absorption coefficient difficult.
The transgressive deposits on the Eel margin exhibit marked variations in thickness alongshore; being thickest in the Eel River Syncline and thinnest over the Eureka Anticline.
It was also found that the variations in magnetic observations were produced by the striking structures that are mainly responsible for the variations in thicknesses of the sedimentary rocks in the area.
The variation in thickness partly reflects femoral growth, with thick bone of the inferomedial aspect preserved into late adulthood by lifelong functional adaptation to stress, and a thin cortex apparent superiorly.
It also was subjected to incomplete fill due to sudden variation in thickness.
Because of the large variation in thickness across growth faults, microfossils are extremely useful in correlating time equivalent horizons from one side to the other.
However, previous observations of complexions in Al2O3 showed that film thickness changes significantly along individual wetting films25, whereas each individual boundary studied here showed no measureable variation in thickness.
