What term describes the systematic removal of low observable coatings ensuring a smooth transition between layers?

The term that accurately describes the systematic removal of low observable coatings to ensure a smooth transition between layers is referred to as "racetracking." This process is critical in the maintenance of low observable aircraft as it helps maintain the aircraft's stealth characteristics by preventing any degradation in performance associated with uneven or poorly integrated coatings.

Racetracking focuses on the meticulous handling of various coatings, ensuring that when one layer is removed, it does not compromise the integrity of the underlying layers. This attention to detail fosters optimal performance and enhances the low observable signature of the aircraft, which is vital for its operational effectiveness.

In contrast, layering typically pertains to the application of multiple coatings rather than their removal and transition. Coating integration generally refers to how different coatings work together on the surface of the aircraft, and layer transition is more of a general term that might refer to the change from one coating type to another without emphasis on systematic removal. Hence, the specificity of racetracking in the context of coatings is what makes it the correct answer.