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+++
title = "Layer"
weight = 36
+++
## Class Layer
A [Sample](/ref/sample/multilayer) and [LayerStack](/ref/sample/multilayer/stack) contain one or several instances
of class `Layer`.
##### Create an instance
Each instance is created using the constructor call
```python
layer_i = ba.Layer(material, thickness=0, roughness=nullptr)
```
Typically, the variable name will contain an index `i`.
By convention, the numbering starts with the top layer, typically `layer_1`.
For the first argument, see [Material](/ref/sample/material).
The optional second argument is the layer thickness in nm.
If it is omitted, then the default value of 0 indicates an infinite thickness;
this is to be used for the bottom or top layer,
or for the sole component of a single-layer sample.
##### Set properties
To add a [ParticleLayout](/ref/sample/multilayer/layout), use
```python
layer_i.addLayout(layout)
```
If there are several layouts, then their scattering intensities will be added incoherently.
To divide the layer into `n` slices for the reflectivity computation, use
```python
layer_i.setNumberOfSlices(n)
```
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