---
license: gpl-3.0
language:
- en
tags:
- science
- physics
metadata:
  parameterization: "slab"
  number_of_layers: 2
  param_ranges:
    thicknesses: [1., 1500.]
    roughnesses: [0., 60.]
    slds: [-8., 16.]
    r_scale: [0.9, 1.1]
    log10_background: [-10.0, -4.0]
  bound_width_ranges:
    thicknesses: [1.0e-2, 1500.]
    roughnesses: [1.0e-2, 60.]
    slds: [1.0e-2, 5.]
    r_scale: [1.0e-3, 0.2]
    log10_background: [1.0e-2, 6.0]
  shift_param_config:
    r_scale: true
    log10_background: true
---

# Model Card for `neutrons-2layers-basic-v1`

## Summary
This is a trained **neutron reflectometry (NR)** model designed for use with the [`reflectorch`](https://pypi.org/project/reflectorch/) package.  

---

## Specifications

- **Number of layers**: 2 (excluding fronting and backing media; ordered from *fronting* → *backing*)  
- **Maximum q-range**: `[0.05, 0.4]`  

### Parameter Types and Ranges

| Parameter            | Range                  | Units              |
|----------------------|------------------------|--------------------|
| Thicknesses            | `[1.0, 1500.0]`        | Å                 |
| Roughnesses            | `[0.0, 60.0]`          | Å                 |
| Nuclear SLDs          | `[-8.0, 16.0]`        | 10⁻⁶ Å⁻²               |
| Intensity scaling    | `[0.9, 1.1]`           | multiplicative factor |
| Background (log₁₀)   | `[-10.0, -4.0]`        | dimensionless      |

---

## Notes on Usage
- For inference, **prior bounds on SLDs** should not exceed a width of **5 Å**.  

---

## License
This model is distributed under the [GPL-3.0 license](https://www.gnu.org/licenses/gpl-3.0.html).