# Electric Field Intensity Modulated Scattering as a Thin-Film Depth Probe

## TL;DR

This paper introduces a novel in-situ method using grazing incidence x-ray scattering to determine thin film thickness, refractive index, and depth distribution of scatterers, validated on polymer films and applicable broadly.

## Contribution

The paper presents a new technique that extracts depth and stratification information from scattering images across incident angles, enhancing thin film analysis capabilities.

## Key findings

- Successfully validated on polymer thin films
- Provides depth and stratification information in situ
- Applicable to any thin-film material

## Abstract

Grazing incidence x-ray scattering provides nanostructural information for thin film samples, but single images generally do not provide information on film thickness or the full complex index of refraction. Additionally, for thin films that possess stratification of scatterers vertically within a sample, it can be difficult to determine where those scatterers are positioned. We present an in-situ method to extract film thickness, the index of refraction, and depth information using scattering images taken across a range of incident angles. The underlying theory is presented, and we validate the technique using two sets of polymer thin films. Finally, we discuss how it can be implemented as a general beamline procedure. This technique is applicable to any thin-film material and has potentially far-reaching impact by enabling depth-sensitive information in situ at any grazing incidence-capable beamline.